Basic Components
A resistor is the electrical component used to oppose the flow of current in a DC circuit. (T6A01)
Most resistors have a fixed value, which is specified in ohms.
Some resistors are variable that is you can change the resistance of the resistor by turning a shaft or
sliding a control back and forth. These variable resistors are called potentiometers.
A potentiometer is the type of component that is often used as an adjustable volume control. (T6A02)
Resistance is the electrical parameter that is controlled by a potentiometer. (T6A03)
The type of electrical component that consists of two or more conductive surfaces separated by an
insulator is a capacitor. (T6A05) A capacitor is the electrical component that stores energy in an
electric field. (T6A04) Capacitance is the ability to store energy in an electric field. (T5C01) The
farad is the basic unit of capacitance. (T5C02)
The type of electrical component that stores energy in a magnetic field is an inductor. (T6A06) The
electrical component that is usually composed of a coil of wire is an inductor. (T6A07) The ability to
store energy in a magnetic field is called inductance. (T5C03) The henry is the basic unit of
inductance. (T5C04)
A switch is the electrical component used to connect or disconnect electrical circuits. (T6A08) A fuse
is the electrical component used to protect other circuit components from current overloads. (T6A09)
As amateur radio operators, we often use batteries to power our radio equipment. Some types of
batteries are rechargeable, while others are not. The battery type that is not rechargeable is the
carbon-zinc battery. (T6A11) All of these choices are correct when talking about battery types that
are rechargeable (T6A10):
•
Nickel-metal hydride
•
Lithium-ion
•
Lead-acid gel-cell
REVIEW QUESTIONS: (15)
T6A01
T6A02
T5C01
T5C02
T5C04
T6A08
T6A03
T6A06
T6A09
T6A04
T6A07
T6A11
T6A05
T5C03
T6A10
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